NUREG-0892, Forwards Suppl to SER Chapter 9 Conditionally Accepting Applicant 830719 Request to Delay Relocation of HPCS Diesel Generator Control Panel & Installation of Air Dryers in Emergency Diesel Generator Air Starting Sys
| ML20213E677 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 10/18/1983 |
| From: | Rubenstein L Office of Nuclear Reactor Regulation |
| To: | Novak T Office of Nuclear Reactor Regulation |
| References | |
| CON-WNP-0661, CON-WNP-661, RTR-NUREG-0892, RTR-NUREG-892 NUDOCS 8311230123 | |
| Download: ML20213E677 (5) | |
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OCT 18 $U Docket No:
50-397 MEMORANDUM FOR: Thomas M. Novak, Assistant Director for Licensing, DL FROM:
L. S. Rubenstein, Assistant Director for Core and Plant Systems, DSI
SUBJECT:
SUPPLEMENT TO CHAPTER 9. SAFETY EVALUATION REPORT -
WPPSS NUCLEAR PROJECT NO. 2 - REVISION TO LICENSE CONDITIONS Plant Name: WPPSS Nuclear Project No. 2 Licensee: Washington Public Power Supply System Docket No: 50-397 Licensing Stage: OL Project Manager:
R. Auluck Systems Integration Branch:
Power Systems PSB Reviewers:
S. Rhow/R. Giardina Review Status: Complete The enclosed Supplement to the Safety Evaluation for the WNP No. 2 covers a change in the implementation dates for the license conditions on control and monitoring instrumentation vibration and installation of diesel engine air starting system air dryers from prior to fuel load to prior to startup following first refueling.
The description in the WNP-2 SER Section 9.5.6 (NUREG-0892, dated March, 1983) on the commitments to install air dryers in the diesel engine starting air system was published incorrectly in that sentences underlined were inadvertently omitted from the text. Though the description of the comitment referenced the wrong letter in the SER, the installation date of fuel load which the staff considered the same as commercial operation was still valid. The description in the SER should read as follows:
The air starting system for the diesel generators relied on periodic blowdown of the air receivers for the removal of entrained oil and excess water from the starting air. Operating experience has shown that accumulation of water in the starting air system has been one of the most frequent causes of diesel engine failure to start on demand. Thus, the staff requires that the engine starting air be dried. Air in the air receivers is saturated to the system air pressure and temperature. Air flow from this point accompanied with reduction in system pressure and/or temperature will result in water
Contact:
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Thomas M. Novak condensation. Because periodic blowdown of the air receivers will not provide dry diesel engine starting air, the staff requires that air dryers be installed upstream of the air receivers.
[The applicant in letters dated January 29 and February 5,1982, ccmmitted to install air dryers upstream of the air receivers by the end of the first refueling, respectively. We find this unacceptable. We require that the air dryer be installed prior to startup. The applicant in a letter dated February 16, 1982 committed to install the air dryers prior to fuel load.] To ensure a continual supply of starting air at the quality level stated in the FSAR, the applicant is providing for monthly verification and/or maintenance of air dryer performance.
The applicant has now provided justification for delaying relocation of the HPCS diesel generator control panel and installation of air dryers in the emergency diesel generator air starting systems from prior to fuel load to prior to startup -following first refueling. We have reviewed this information and find the change acceptable.
0;Igina! t ri'oy L. S. Rub.sicin L. S. Rubenstein, Assistant Director for Core and Plant Systems Division of Systems Integration
Enclosure:
As stated cc w/ enclosure:
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ENCLOSURE SUPPLEMENT TO CHAPTER 9 SAFETY EVALUATION REPORT 9.4.5.1 Emeroency Diesel'Enoine Auxiliary Sueoort Systems (General)
As stated in the SER, the applicant committed in a. Letter dated January 29, 1982, "to have all controls and monitoring instrumentation that are mounted on the engine skid installed in a freestanding floor mounted panel separate from the engine skids, and located in a vibration free floor area."
The staff imposed a license condition that this be completed prior to startup.
In a letter dated July 19, 1983 the applicant
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requested a change in the completion date from prior to startup to prior to startup following first refueling for the HPCS diesel generator only, and a modification of the license condition which would allow the applicant to qualify the controls and monitoring instrumentation ~for the vibration environment.
Th'e delay in the 'com'pletion of the license condition is based on the fact that other plants with similar HPCS diesel engines are qualifying the controls and monitoring instruments in the near future and the applicant wishes to take advantage of the data obtained from those qualification programs as a means of qualifying the controls and monitoring instrumentation for the HPCS diesel generator at WNP 2^.
The staff finds the justification and the implementation date delay reasonable and is therefore acceptable.
. Thus the license condition for the HPCS diesel generator should be modified to the folLowing:
1 Prior to startup folLowing the first refuelings the controls and monitoring instrumentation that are mounted on the HPCS diesel engine skid shall be installed in a freestanding floor mounted panet separate from the engine skid and Located in a vibration free floor area or qualify,the controls and monitoring instrumentation for the vibrations that wilL occur during engine operation.
9.5.6 Emergency Diesel Encine Startina System In a" Letter dated September 14, 1983, the applicant addressed some difficulties concerning the installation date for the air dryers and requested a delay of its installation un t i l first refueling.
The applicant justified the delay at this time by staffing that " procurement and installation of the air dryers i
by fuel Load or commercial operation will affect the present l
schedule of fuel load and continued plant operation."
In addition he also stated that the primary methods and design 1
features for eliminating moisture are:
(1 ) heated (minimum 0
70 F) temperature controlled room for air supply to the dryers, (2) pressure reducing valves (250 to 210 psi) which wilL l
cause any moisture passing through them to remain as vapor since lower pressure air wilL hold more moistures and e
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, (3) daily operation of Low point drains and air receiver drains.
Based on the above justification and commitment, the staff finds the requested delay in the installation of the air dryers prior to startup folLowing first refueling is reasonable and is therefore acceptable.
Thus, we require the License to be conditioned as follows:
" Prior to startup following the first refueling outage air dryers shalL be installed in the diesel engine air starting system upstream of the air receivers."
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